- Coolant Level: Start by checking the coolant level when the engine is cold. It should be at or slightly above the low mark on the overflow tank. If it's low, top it off and keep an eye out for any leaks.
- Radiator Hoses: Once the car is warm, feel the radiator hoses. They should be firm, not soft. If they're soft, consider replacing the coolant pressure cap.
- Thermostat and Car Temperature: Use a scanner to check the car's operating temperature. If it doesn't reach around 190°F or more, the thermostat might need replacing, assuming the coolant level and pressure cap are fine.
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